Submodule unit of voltage source transverter based on full control components

A voltage source converter and sub-module technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the problem of reducing work efficiency and operability, equipment dv/dt stress Large, harsh electromagnetic environment, etc., to achieve the effects of convenient installation and transportation, low output voltage change rate, and insensitive switching device parameters

Active Publication Date: 2015-03-25
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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AI Technical Summary

Problems solved by technology

[0004] (1) The two-level voltage source converter adopts pulse width modulation technology, and the output voltage of the converter jumps between ±Udc / 2 at high frequency, which brings about large dv / dt stress of equipment, large system loss, A series of problems such as high noise and harsh electromagnetic environment
Even the three-level voltage source converter can only alleviate the above problems to a certain extent
[0005] (2) The two-level and three-level voltage source commutation adopts the switching device series technology. Due to the scattered parameters of the switching device itself, it is necessary to equip each switching device with complex static voltage equalization circuit, dynamic voltage equalization circuit and absorption circuit during design. , causing potential failure to valve operation
It causes high requirements for on-site installation, and at the same time brings inconvenience to equipment maintenance, reducing work efficiency and operability

Method used

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  • Submodule unit of voltage source transverter based on full control components
  • Submodule unit of voltage source transverter based on full control components
  • Submodule unit of voltage source transverter based on full control components

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Embodiment Construction

[0041] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] The sub-module unit of the voltage source converter of this embodiment adopts an independent control mode, and the electrical schematic diagram of the sub-module unit is as follows figure 1 As shown, this is the parallel structure of the IGBT module and the capacitor of the half-bridge structure. In this embodiment, the half-bridge structure or the upper half of the H-bridge structure is defined as the upper-side IGBT module, for example figure 1 The IGBT module composed of the IGBT (S1) and the built-in diode D1 in parallel is the upper tube IGBT module (referred to as the upper IGBT), and the lower part of the half bridge structure or the H bridge structure is the lower tube IGBT module, for example figure 1 The IGBT module composed of the IGBT (S2) and the built-in diode D2 connected in parallel is a lower-side...

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Abstract

A submodule unit of a voltage-source converter based on a full-controlled device. The voltage-source converter is of a three-phase six-bridge-arm structure. Each bridge arm comprises N submodule units connected in series. The submodule unit comprises an electric power component mainly composed of a capacitor (C) and an IGBT module of a half-bridge structure, a main support structure (5), a support plate (8), a connecting waterpipe (9) and radiators (10). The main support structure is used for supporting the electric power component, the support plate, the connecting waterpipe and the radiators of the submodule unit. The support plate is arranged perpendicular to a base of the main support structure. Two symmetrically arranged radiators are provided on the support plate, and the radiators are connected by the connecting waterpipe. Two IGBT modules of each submodule unit are respectively placed on the two radiators. The bottom of the capacitor of each submodule unit is fixed to the base of the main support structure by bolts. The submodule unit is independent in structure, and is convenient in installation and transportation.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to a sub-module unit of a voltage source converter based on a full-control device. Background technique [0002] The high-voltage direct current transmission technology (VSC-HVDC) based on the voltage source converter was first proposed in 1900. Its main feature is that the voltage source converter composed of fully controlled power electronic devices replaces the half-controlled direct current transmission based on the conventional direct current transmission. Devices for current source converters. Since the technology was proposed, it has attracted the attention of many scholars and researchers all over the world due to its excellent controllability and flexibility. [0003] So far, there are several high-voltage direct current transmission projects based on voltage source converters in the world. There are some problems with the structur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00
CPCH05K7/20927H02M7/003H02M2007/4835H02M7/4835
Inventor 汤广福贺之渊栾洪洲吕铮欧阳文敏
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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